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Fair Value of Financial Instruments - Changes in Level 3 Portfolio Investments Rollforward (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Total |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | $ 1,632,922 | $ 1,468,282
Investments purchased | 608,596 | 920,114
Accretion of discount | 11,032 | 11,737
Sales and principal repayments | (498,527) | (802,666)
Ending balance | 1,716,054 | 1,632,922
Change in net unrealized (depreciation) appreciation on investments still held | (45,670) | 17,553
Total | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (32,747) | 3,878
Total | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (5,222) | 31,577
Senior Secured First Lien Debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 1,526,989 | 1,223,268
Investments purchased | 549,950 | 889,038
Accretion of discount | 10,517 | 10,940
Sales and principal repayments | (480,717) | (601,441)
Ending balance | 1,579,512 | 1,526,989
Change in net unrealized (depreciation) appreciation on investments still held | (39,831) | 2,341
Senior Secured First Lien Debt | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (5,646) | (210)
Senior Secured First Lien Debt | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (21,581) | 5,394
Senior Secured Second Lien Debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 38,583 | 151,506
Investments purchased | 19,930 | 1,885
Accretion of discount | 500 | 783
Sales and principal repayments | (15,521) | (115,761)
Ending balance | 38,769 | 38,583
Change in net unrealized (depreciation) appreciation on investments still held | 801 | (1,621)
Senior Secured Second Lien Debt | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (19,327) | (2,932)
Senior Secured Second Lien Debt | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | 14,604 | 3,102
Collateralized Securities and Structured Products - Equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 2,998 | 12,131
Investments purchased | 0 | 0
Accretion of discount | 0 | 0
Sales and principal repayments | (1,222) | (12,090)
Ending balance | 1,179 | 2,998
Change in net unrealized (depreciation) appreciation on investments still held | (621) | 1,152
Collateralized Securities and Structured Products - Equity | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | 24 | 670
Collateralized Securities and Structured Products - Equity | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (621) | 2,287
Unsecured debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 26,616 | 5,464
Investments purchased | 3,635 | 21,095
Accretion of discount | 15 | 14
Sales and principal repayments | 0 | 0
Ending balance | 22,643 | 26,616
Change in net unrealized (depreciation) appreciation on investments still held | (7,623) | 43
Unsecured debt | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | 0 | 0
Unsecured debt | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (7,623) | 43
Equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Beginning balance | 37,736 | 75,913
Investments purchased | 35,081 | 8,096
Accretion of discount | 0 | 0
Sales and principal repayments | (1,067) | (73,374)
Ending balance | 73,951 | 37,736
Change in net unrealized (depreciation) appreciation on investments still held | 1,604 | 15,638
Equity | Debt and Equity Securities, Realized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | (7,798) | 6,350
Equity | Debt and Equity Securities, Unrealized Gain (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total gains or losses included in earnings | $ 9,999 | $ 20,751

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